how to take all the files with `.flg` Extension and put the numbers on a list [closed]

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i have files in c:\MyData for example:

demo.txt
test.ini
COUNT030.flg
COUNT011.flg
COUNT020.flg
COUNT031.flg
COUNT045.flg
COUNT067.flg

i need to take all the files with .flg Extension and to put the numbers on list like this:

30
11
20
31
45
67

how to do this in C# WinForm ?

thanks in advance

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You can use Directory.EnumerateFiles(String, String) or Directory.GetFiles method and mask *.flg. Then use Path.GetFileNameWithoutExtension to extract file-name without extension, then apply regex \d+$ to match number.

Example:

var result = Directory
    .EnumerateFiles(path, "*.flg")
    .Select(s => int.Parse(Regex.Match(Path.GetFileNameWithoutExtension(s), @"\d+$").Value));

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        DirectoryInfo dirInfo = new DirectoryInfo(folderPath);
        var numbers = from fileInfo in dirInfo.EnumerateFiles("*.flg")
                      let fileName = Path.GetFileNameWithoutExtension(fileInfo.Name)
                      select int.Parse(fileName.Substring("Count".Length, 3));

        List<int> lst = numbers.ToList();

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So, as promised the sample:

DirectoryInfo di = new DirectoryInfo(@"c:\temp\");
FileInfo[] fis = di.GetFiles("*.flg");
foreach (FileInfo fi in fis)
{
    Console.WriteLine("File Name: {0}, Full Name: {1}, Number: {2}", fi.Name, fi.FullName, fi.Name.Substring(fi.Name.LastIndexOf(".") - 3, 3));
}

for extracting the numbers look at the Substring in the sample.